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Docker and Python GUI application

#docker   #python   #gui   #app  

Table of Content

Docker and Python GUI application#

Package and Deploy Python TKInter GUI application using Docker

Project#

.
├── .devcontainer
│   └── Dockerfile
├── py_gui_app
│   ├── app2.py
│   └── app.py
└── README.md

Dockerfile#

Using multistage Docker file - Base - Dev (TODO) - Deploy

FROM python:3.8.12-slim as app_base

RUN apt-get update -y

# Install Tkinter
RUN apt-get install tk -y

# Deploy
FROM app_base as app

# Copy app.py script to docker root
ADD /py_gui_app/app.py .
# cmd use as arguments to entrypoint
CMD ["app.py"]  
ENTRYPOINT ["python3"]
  • RUN: Execute commands and create new image layer.
  • CMD: Sets the command and its arguments to executed after container start. It’s can be override by docker run command line arguments
  • ENTRYPOINT: Configures the command to run when the container starts,

Tip

  1. Exec command: CMD ["executable", "param1", "param2"]
  2. CMD ["param1", "param2"] is use with ENTRYPOINT and provide extra parameters
  3. Shell format: CMD command param1 param2

Tip

docker run --entrypoint="path/to/custom/entrypoint" imagename

TKInter#

import tkinter as tk

# Tkinter Window
root_window = tk.Tk()

# Window Settings
root_window.title('Application Title')
root_window.geometry('300x100')
root_window.configure(background = '#353535')

# Text
tk.Label(root_window, text='Hello World', fg='White', bg='#353535').pack()

# Exit Button
tk.Button(root_window, text='Exit', width=10, command=root_window.destroy).pack()

# Main loop
root_window.mainloop()

Build And Usage#

Build app target#

docker build --target app \
-f Dockerfile \
-t my_gui_app:app ..
Tag description
–target app Build docker using the app stage
-f Dockerfile name to use
-t Tag image name
.. Set build context

Docker build context

A build’s context is the set of files located in the specified PATH or URL . The build process can refer to any of the files in the context

Run#

docker run --entrypoint="/bin/sh" \
        -u=$(id -u $USER):$(id -g $USER) \
        -e DISPLAY=$DISPLAY \
        -v /tmp/.X11-unix:/tmp/.X11-unix:rw \
        --rm \
        my_gui_app:app

override entrypoint#

  • Login in to sh terminal 
docker run 
    --entrypoint="/bin/sh" \
    -u=$(id -u $USER):$(id -g $USER) \
    -e DISPLAY=$DISPLAY \
    -v /tmp/.X11-unix:/tmp/.X11-unix:rw \
    --rm \
    -it \
    my_gui_app:app

Reference#